初中化学和高中化学相比 ,不论知识的难易程度 ,还是对学生学习能力的要求 ,都存在质的飞跃。加之高一化学课时较少 ,中学化学重点知识相对集中 ,以及课本内容和所编选习题与各类考试题之间存在的差异 ,导致许多学生刚上高一感到难以适应 ,同时又觉得化学课知识相对易学但题难 Compared with junior high school chemistry, junior high school chemistry has a qualitative leap, regardless of the degree of difficulty of knowledge or the requirement of students’ learning ability. In addition, there are fewer high school chemistry classes, relatively concentrated middle school chemistry knowledge, and the differences between textbook contents and selected exercises and examination questions, leading many students to become freshmen and find it difficult to adapt. Relatively easy to learn but difficult